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authorAndi Kleen <andi@firstfloor.org>2010-08-09 17:20:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-09 20:45:06 -0700
commit8c4af38e9b2c2a78369c4e2e5706fe539ac64eb2 (patch)
tree17671814cc7afb4e5eaafad32f0ed0c428764515
parent547415d5edf8660aee040dc81d8c71b081a59bda (diff)
gcc-4.6: printk: use stable variable to dump kmsg buffer
kmsg_dump takes care to sample the global variables inside a spinlock, but then goes on to use the same variables outside the spinlock region too. Use the correct variable. This will make the race window smaller. Found by gcc 4.6's new warnings. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/printk.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/kernel/printk.c b/kernel/printk.c
index 4ab0164bcf8..8fe465ac008 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -1549,9 +1549,9 @@ void kmsg_dump(enum kmsg_dump_reason reason)
chars = logged_chars;
spin_unlock_irqrestore(&logbuf_lock, flags);
- if (logged_chars > end) {
- s1 = log_buf + log_buf_len - logged_chars + end;
- l1 = logged_chars - end;
+ if (chars > end) {
+ s1 = log_buf + log_buf_len - chars + end;
+ l1 = chars - end;
s2 = log_buf;
l2 = end;
@@ -1559,8 +1559,8 @@ void kmsg_dump(enum kmsg_dump_reason reason)
s1 = "";
l1 = 0;
- s2 = log_buf + end - logged_chars;
- l2 = logged_chars;
+ s2 = log_buf + end - chars;
+ l2 = chars;
}
if (!spin_trylock_irqsave(&dump_list_lock, flags)) {